- North Carolina Agricultural Experiment Station4
- United States. Department of Agriculture4
- North Carolina. Department of Agriculture3
- North Carolina State University -- Students2
- Capitol Agricultural Service and Supply Co.1
- Corneli Seed Company1
- Covington, H. M.1
- Farm Journal (Philadelphia, Pa. : 1956)1
- Horticultural Crops Research Station (Castle Hayne, N.C.)1
- Huang, B. K.1
- J. G. Van Holten and Sons, Inc. (Waterloo, Wisconsin)1
- Lockwood Grader Corporation1
- McCollum, Robert Edmund1
- Mountain Horticultural Crops Research Station (Fletcher, N.C.)1
- Mountain Research Station (Waynesville, N.C.)1
- Mt. Olive Pickle Company, Inc.1
- National Institute of Agricultural Engineering (Great Britain)1
- New York State College of Agriculture. Dept. of Agricultural Engineering1
- North Carolina Agricultural Extension Service1
- North Carolina State College. Department of Agricultural Engineering1